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Piezoelectric actuators can offer high resolution of displacement and this makes them suitable for precise driving tasks. However, most piezoelectric actuators are made of piezoceramics which have a major drawback related to their natural hysteresis nonlinearity. To compensate the hysteresis nonlinearity of piezoelectric actuators, many hysteresis models(More)
ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ ⅷ Integrated structure᎐control design of a two-link flexible robot arm is investigated in this article. The whole arm consists of two flexible links, a fixed joint, a moving joint, and a tip load. The arm is driven by the torque motors at the two joints to reach predefined tip positions and(More)
A new wave energy flow (WEF) map concept was proposed in this work. Based on it, an improved technique incorporating the laser scanning method and Betti's reciprocal theorem was developed to evaluate the shape and size of damage as well as to realize visualization of wave propagation. In this technique, a simple signal processing algorithm was proposed to(More)
The intrinsic hysteresis behavior of piezoelectric material limits the tracking control accuracy of the actuators. This paper describes a tracking control method for piezoelectric actuators based on the combination of feedforward and feedback loops. The hysteresis of piezoelectric actuators is linearized in feedforward loop with an inverse hysteresis model(More)
Simultaneous structural-control optimization of a coupled structural-acoustic enclosure is investigated in this paper. The whole system has a rectangular parallelepiped sound field of which the entire bottom face and the partial top face are covered with two elastic plates while the other boundaries are enclosed with rigid walls. Two point forces applied on(More)
Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO3), its high permittivity can only be achieved by chemical and/or structural modification. Here, we report the room-temperature colossal permittivity (~760,000) obtained in xNd:(More)
Aircraft stiffened panel is used as a control object and active structural acoustic control system is set up to mimic real aircraft cabin noise control problem, since sound isolation performance of the panel is poor at low frequencies. According to Rayleigh integral theory, there is a close relationship between the panel's volume acceleration signal and far(More)
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